The standard stuff:
This is an educational resource and although it's primarily for use between educators involved in a specific project, some materials will be adapted and used in schools so the usual rules apply:
Please express yourself in socially acceptable terms.
Don't link to any sites with content that's likely to cause offense.
If you're in school or some other public place, don't leave yourself logged in and wander off, leaving the site open to abuse.
Generally, be polite, helpful and public spirited. You get the idea.
There's a lot on the web about wiki etiquette and general web etiquette. Have a little browse around if you're not familiar.

Editing and correcting.
The idea of a wiki is that we can edit one another's work on pages; I'd suggest in this case that we use our judgement in this respect. Feel free to correct errors that are factual, grammatical etc. In the case of differences of opinion, it may be better to use discussion and comment rather than first time editing. This is a relatively small wiki group, so I think that should work.
If we're talking about different teaching and learning approaches to the same thing, let's add or discuss rather than edit pages that others have created, or start a new page and link.
Let's try to keep the structure and navigation clear and easy. If you produce a new page, think about the structure and links, please. In particular, it can be difficult to stop sidebar menus in wikis from becoming unwieldy. Let's try to keep the menu structure simple and clear with main pages only. If we end up with a lot of child pages we'll add a site map page. This will mean frequent contributors learning how to edit the menu bar if they don't already know how.
If you are in any doubt, consult the page creator (look at revisions in the 'pages' section - the earliest dated revision will by by the page creator)

Resources.
This is a free wiki so we do have a limited allocation of space, so if you're appending resources, please consider the memory use.
Compress images in office documents - if you don't know how to do that, check tips on documents.
Similarly, pick compressed image formats like jpeg.
People often want to make minor tweaks to documents for their own use; does yours need saving as a separate resource?
If you have a freely accessible server that you can host your own documents on, think about keeping them there and linking, rather than storing bulky resources on the wiki.

If you have any doubts at all about making wiki contributions, ask for advice.